The hydrophobic portions of a membrane's phospholipid bilayer are oriented toward the interior of the membrane.

Name: The hydrophobic portions of a membrane's phospholipid bilayer are oriented toward the interior of the membrane.
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Hydrophobic portions of phospholipid bilayer are nonpolar and repel water. Hence, they face each other, creating a hydrophobic interior, while the hydrophilic (polar) heads face the aqueous environment (either inside or outside the cell).

The Hydrophobic Portions of a Membrane's Phospholipid Bilayer Are Oriented